Forms of Energy
Work and Power
Conservation of Energy
Elastic Potential Energy
Energy and Motion
Energy and Momentum
100
Name the type of energy an object possesses due to its occurring motion
Kinetic Energy
100
What is the formula for work? (Explain each of the variables in word form, not just their respective letters)
W= fd
"Word equals force multiple by distance/displacement"
100
What does the Law of Conservation of Energy state?
"Energy can neither be created nor destroyed , but can only be transformed from one form to another."
100
What is the formula needed to solve for the force of a rubber band?
Fs=kx
100
What is the formula for kinetic energy? (Explain each variable in word form, not just their respective letters)
KE = 1/2mv2
"Kinetic energy equals one-half times mass multiplied by velocity squared"
100
DOUBLE JEOPARDY: 💥
What is the formula for momentum? (Explain each variable in word form, not just their respective letters)
p=mv
"Momentum equals mass times velocity"
200
What type of energy is stored in an object due to its height above the ground?
Gravitational Potential Energy
200
One example of a force doing work is the force exerted by:
1.) Earth on a high diver falling toward a pool from a platform above
2.) A hook on an engine held stationary above a car
3.) A frictionless horizontal air hockey table on a puck moving across the table at a constant velocity
4.) A weightlifter on a barbell he holds motionless over his head
1.) Earth on a high diver falling toward a pool from a platform above
200
What happens to potential energy as an object falls?
The potential energy decreases as it converts to kinetic energy
200
Find the Force of a spring that is compressed 0.2m and has a spring constant of 400 N/m
Fs=80N
200
DOUBLE JEOPARDY: 💥
As an object falls freely near the Earth's surface, the loss in gravitational potential energy of the object is equal to its...
Gain in Kinetic Energy
200
DOUBLE JEOPARDY: 💥
Finish the statement: if the velocity of an object doubles, its kinetic energy will...
Quadruple
300
Describe the energy transformation that occurs when a car engine burns fuel.
Chemical Energy → Thermal Energy → Mechanical Energy
300
Given that watt is the SI Unit for power, convert one watt in terms of energy and time.
1 Watt (W) is equivalent to 1 Joule per Second (J/s)
300
DOUBLE JEOPARDY: 💥
If total mechanical energy is conserved, what happens to energy in a frictionless system?
The sum of kinetic energy and potential energy remains constant
300
How can you find the Potential Energy of a spring using an object's velocity that will compress a spring x distance with an initial speed of v?
Using the Kinetic Energy formula as an alternative.
300
Compare the total mechanical energy of the car and passenger at points A, B, and C.
The total mechanical energy is the same at all three given points
300
DOUBLE JEOPARDY: 💥
A 5 kg object moving at 4 m/s collides with a stationary 3 kg object. After the collision, the two objects stick together. What is their combined velocity?
Answer: 2.5 m/s
400
Describe what happens to the gravitational potential energy (PE), kinetic energy (KE), and internal (thermal) energy (Q), of a wooden crate as it is pushed across a level classroom floor at constant speed?
The PE remains the same, KE remains the same, and Q increases.
400
DOUBLE JEOPARDY: 💥
A student rides a bicycle up a 30.° hill at a constant speed of 6.00 meters per second. The combined mass of the student and the bicycle is 70.0 kilograms. What is the kinetic energy of the student-bicycle system during this ride?
Answer: 1,260 Joules
*Explanation: In order to solve you must've ignored the angle provided as it was unnecessary information. Then start your work off by plugging given values into the formula KE=1/2mv2
400
Write or provide a description of the conservation of energy equation.
Multiple answer response as follows from Alonso's lesson:
1. Total Energy Before = Total Energy After + Dissipated Energy
2. Kinitial + Ug intial = Kfinal + Ug final + Dissipated
3. ME = KE + PE + Q
400
A spring, with a spring constant of 100. newtons per meter, possesses 2.0 joules of elastic potential energy when compressed. Calculate the spring’s change in length from its uncompressed length.
x=0.2m
400
A 50 kg object is lifted vertically 8 meters. How much gravitational potential energy does it gain? (Assume g = 9.81 m/s².)
Answer: 3924 J
400
DOUBLE JEOPARDY: 💥
The diagram above shows two carts on a horizontal, frictionless surface being pushed apart when a compressed spring attached to one of the carts is released. Cart A has a mass of 3.0 kilograms and cart B has a mass of 5.0 kilograms. The speed of cart A is 0.33 meter per second after the spring is released. If the carts are initially at rest, what is the approximate speed of cart B after the spring is released?
Answer: 0.20m/s
500
DOUBLE JEOPARDY: 💥
A 2 kg block is pushed up a rough 10-meter incline at a constant speed. The incline makes a 30° angle with the horizontal, and the coefficient of kinetic friction between the block and the incline is 0.2. How much work is done by the applied force to move the block up the incline? Round to the nearest whole number. (Assume g = 9.81 m/s².)
Answer: 132 J
500
A 75 kg worker carries a 20 kg box up a staircase with a vertical height of 6 meters in 10 seconds. If the worker's power output includes lifting both their body weight and the box, what is the total power produced? Round to the nearest tenth.
(Assume g = 9.81 m/s².)
Answer: 559.2 W
500
Provide an explanation as to why energy is not perfectly conserved in real-world scenarios.
In the situation of real-world scenarios, energy is lost as heat or sound due to factors like friction or air resistance
500
How would the Law of Conservation of Energy apply to a car's springs in their suspension when a car goes over a street hump?
The compression of the spring would absorb the energy that the wheel sends to the car and transfer it to Kinetic Energy or Heat Energy/ Sound Energy which is dissipated
500
A 4 kg object initially moving at 10 m/s comes to rest due to friction. If 200 J of work is done by friction, how far does the object slide?
Answer: 5 m
500
DOUBLE JEOPARDY: 💥
A 0.15 kg baseball is thrown with a speed of 20 m/s. If the baseball is caught and brought to rest in 0.1 seconds, what is the magnitude of the average force exerted on the baseball?
Answer: 30 N